Graphic user interface for a portion of a display screen



The FIGURE is a front view for a graphic user interface portion of a display screen showing our new design.

The broken line showing of a region and the unshaded area there within forms no part of the claimed design. The broken line showing a portion of a display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a graphic user interface portion of a display screen, as shown and described. 